Anti-lost alarm is an electronic personal reminder alarm, it can remind you that your purse, your children or your pet have gone far away. Also you can use it to seek them back. The receiver will be kept with the host; the transmitter will be kept with the things to be protected. The receiver reminds the host by warning tone and vibration if the transmitter is away from the receiver beyond the distance set by you freely. These products are suitable for the mobile, wallet, baggage, pets and your kids, etc. Besides, they are light and easy to carry. The transmitter of TF320 is smaller than the one of TF310